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Related Manuals for LG FLATRON L1942HE-BF
Summary of Contents for LG FLATRON L1942HE-BF
- Page 1 Internal Use Only Website:http://biz.LGservice.com COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM72A MODEL: L1942H E(L1942HE-BFT.A***OPN) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. AUTO/SET VOLUME *To apply the MSTAR Chip .
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Page 2: Table Of Contents
: 4.9 kg (10.89 lbs) Horizontal : 30 ~ 83kHz Gross Weight : 6.49 kg (14.22 lbs) Vertical : 56 ~ 75Hz LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 2 - Only for training and service purposes... -
Page 3: Precautions
CAUTION Please use only a plastic screwdriver to protect yourself from shock hazard during service operation. LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 3 - Only for training and service purposes... - Page 4 8. Always connect the test receiver ground lead to the receiver chassis ground before connecting the test receiver positive lead. Always remove the test receiver ground lead last. LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 4 - Only for training and service purposes...
- Page 5 IC. circuit board to prevent excessive component temperatures. LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 5 - Only for training and service purposes...
- Page 6 Solder the overlapped area and clip off any excess jumper wire. LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 6 - Only for training and service purposes...
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Page 7: Timing Chart
1280 x 1024 V(Lines) 60.02 1066 1024 H(Pixels) 135.0 79.976 1688 1280 1280 x 1024 V(Lines) 75.035 1066 1024 LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 7 - Only for training and service purposes... -
Page 8: Disassembly
1.Pull the front cover upward Disassemble back cove. 2.Then,let the all latches are separated. 3.Put the front face down. LGE Internal Use Only Copyright? 2008 LG Electronics. Inc. All right reserved. - 8 - Only for training and service purposes... -
Page 9: Block Diagram
BLOCK DIAGRAM LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 9 - Only for training and service purposes... - Page 10 BLOCK DIAGRAM-POWER LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 10 - Only for training and service purposes...
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Page 11: Discription Of Block Diagram
The Micom distinguishes polarity and frequency of the H/V sync are supplied from signal cable. The controlled data of each modes is stored in EEPROM. LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 11 - Only for training and service purposes... - Page 12 This part function is to collect the any change from the DC output and feed back to the primary through photo transistor. LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 12 - Only for training and service purposes...
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Page 13: Adjustment
Click “ Write” button c) Remove all default number d) Add 300-3FF e) Click Start button. f) Click Exit button. LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 13 - Only for training and service purposes... -
Page 14: Service Osd
74LS06 Power LED 4.7K 74LS06 E ST Switch F V-Sync On/Off Switch (Switch must be ON.) Figure 1. Cable Connection LGE Internal Use Only Copyrightⓒ2008 LG Electronics. Inc. All right reserved. - 14 - Only for training and service purposes... -
Page 15: Troubleshooting Guide
Is U501 Pin75 (3.3V) Check 3.3V Line Voltage ? Check U501 Pin 96 Check X-TAL Pulse Check U501 Waveforms U501-#96 LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 15 - Only for training and service purposes... - Page 16 (CONTACT PROBE TO CAUTION LABEL. CAN YOU SEE PULSE AT YOUR SCOPE? REPLACE CCFL LAMP IN THE LCD MODULE LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 16 - Only for training and service purposes...
- Page 17 AT SIGNAL PINS? AT MODE 12? TROUBLE IN CABLE OR LCD MODULE Waveforms U201-#96, 97 U201-#27 H-SYNC U201-#28 V-SYNC LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 17 - Only for training and service purposes...
- Page 18 INTO DPM OFF MODE CHECK U201 PIN 27,28 CHECK H/V SYNC LINE SYNC PULSE ? TROUBLE IN U501 Waveforms R730 H-Syn R731V-Sync LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 18 - Only for training and service purposes...
- Page 19 Check Q101 Drain Trouble in Q101 Waveform Check D201, D202 Trouble in D201, D202,D203 D203,Voltage CHECK 5V, 15V Line LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 19 - Only for training and service purposes...
- Page 20 If waveform is no problem Check D302~D308 Check U303, U304 Or Trouble in U303, U304 Drain waveform CHECK T301 LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 20 - Only for training and service purposes...
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Page 21: Wiring Diagram
WIRING DIAGRAM EAD37413101 EAD42157802 6631900011J LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 21 - Only for training and service purposes... -
Page 23: Replacement Parts List
SCHEMATIC DIAGRAM 1. SCALER LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. -23- Only for training and service purposes... - Page 24 2. POWER & WAFER LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 24 - Only for training and service purposes...
- Page 25 3. INVERTER LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 25 - Only for training and service purposes...
- Page 26 4. POWER LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 26 - Only for training and service purposes...
- Page 27 MAR. 2010 P/NO : MFL40349781 Printed in China...